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the solution:
5
9
1
4
8
7
6
2
3
2
7
4
6
9
3
1
8
5
6
3
8
2
1
5
9
7
4
9
4
2
5
6
1
7
3
8
7
1
5
8
3
9
2
4
6
3
8
6
7
2
4
5
9
1
8
6
9
3
5
2
4
1
7
4
2
3
1
7
6
8
5
9
1
5
7
9
4
8
3
6
2